cmake_minimum_required(VERSION 3.15)

# set the project name and version
project(Tutorial VERSION 1.0)


set(CMAKE_INSTALL_PREFIX ${PROJECT_BINARY_DIR}/install)
# reference: https://cmake.org/cmake/help/latest/guide/importing-exporting/index.html#exporting-targets-from-the-build-tree
# 如果使用Exporting Targets from the Build Tree，需要设置
#export(EXPORT　有可能等于　export(TARGETS　和　export (PACKAGE MathFunctions)
set(CMAKE_PREFIX_PATH ${PROJECT_BINARY_DIR}/MathFunctions)

add_library(tutorial_compiler_flags INTERFACE)
target_compile_features(tutorial_compiler_flags INTERFACE cxx_std_11)

# add compiler warning flags just when building this project via
# the BUILD_INTERFACE genex
set(gcc_like_cxx "$<COMPILE_LANG_AND_ID:CXX,ARMClang,AppleClang,Clang,GNU>")
set(msvc_cxx "$<COMPILE_LANG_AND_ID:CXX,MSVC>")
target_compile_options(tutorial_compiler_flags INTERFACE
  "$<${gcc_like_cxx}:$<BUILD_INTERFACE:-Wall;-Wextra;-Wshadow;-Wformat=2;-Wunused>>"
  "$<${msvc_cxx}:$<BUILD_INTERFACE:-W3>>"
)

# control where the static and shared libraries are built so that on windows
# we don't need to tinker with the path to run the executable
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}")

option(BUILD_SHARED_LIBS "Build using shared libraries" ON)

# configure a header file to pass the version number only
configure_file(TutorialConfig.h.in TutorialConfig.h)

# 第二步，注释add_subdirectory(MathFunctions)，找包即可
# add_subdirectory(MathFunctions)

find_package(MathFunctions REQUIRED)

# add the executable
add_executable(Tutorial tutorial.cxx)
target_link_libraries(Tutorial PUBLIC MathFunctions::MathFunctions MathFunctions::myString)

# add the binary tree to the search path for include files
# so that we will find TutorialConfig.h
target_include_directories(Tutorial PUBLIC
                           "${PROJECT_BINARY_DIR}"
                           )

# add the install targets
install(TARGETS Tutorial DESTINATION bin)
install(FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h"
  DESTINATION include
  )

# # enable testing
# enable_testing()

# # does the application run
# add_test(NAME Runs COMMAND Tutorial 25)

# # does the usage message work?
# add_test(NAME Usage COMMAND Tutorial)
# set_tests_properties(Usage
#   PROPERTIES PASS_REGULAR_EXPRESSION "Usage:.*number"
#   )

# # define a function to simplify adding tests
# function(do_test target arg result)
#   add_test(NAME Comp${arg} COMMAND ${target} ${arg})
#   set_tests_properties(Comp${arg}
#     PROPERTIES PASS_REGULAR_EXPRESSION ${result}
#     )
# endfunction(do_test)

# # do a bunch of result based tests
# do_test(Tutorial 4 "4 is 2")
# do_test(Tutorial 9 "9 is 3")
# do_test(Tutorial 5 "5 is 2.236")
# do_test(Tutorial 7 "7 is 2.645")
# do_test(Tutorial 25 "25 is 5")
# do_test(Tutorial -25 "-25 is [-nan|nan|0]")
# do_test(Tutorial 0.0001 "0.0001 is 0.01")

# include(InstallRequiredSystemLibraries)
# set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/License.txt")
# set(CPACK_PACKAGE_VERSION_MAJOR "${Tutorial_VERSION_MAJOR}")
# set(CPACK_PACKAGE_VERSION_MINOR "${Tutorial_VERSION_MINOR}")
# include(CPack)
